#123
Rabbi Shimon says that if the holiday comes on Shabbat, the third meal can be elevated to the meal of the second day of the holiday. If the holiday is on Sunday, which starts after Shabbat, we don’t cancel the third meal.
When Passover is after Shabbat we skip the third meal because we cannot have a proper meal without bread. We are not allowed to eat bread in the afternoon before the night of the Seder. A Shabbat meal should be with bread and Birkat Hamazon.

#124
The third meal can be done with a blessing over wine because it doesn’t take away the appetite for the meal of the holiday that comes soon after.
Rabbi Shimon says that he never missed a meal of Shabbat, even if the holiday falls on the same day. He explains that Malchut is blessed on this day that connects us to the Torah. Every blessing we do on Shabbat connects us to the Holiness of the day.

#125
Rabbi Aba tells us that Rabbi Shimon was setting the table for the third meal and study the deeper secrets of the Torah. He was declaring “this is the meal for the King that would come to eat with me”. Because of that, Shabbat is considered to be Holy and above all holidays.

Lesson;
The doc below includes the ‘declaration’ we do before the meals of Shabbat to connect us to the Holiness level of the meal.
It’s free to share with anyone.